According to the writer, the most significant thing about tortoises is that

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问题 According to the writer, the most significant thing about tortoises is that

选项 A、they are able to adapt to life in extremely dry environments.
B、their original life form was a kind of primeval bacteria.
C、they have so much in common with sea turtles.
D、they have made the transition from sea to land more than once.

答案D

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